Which best defines partial pressure in a mixture of gases?

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pressure that is exerted by all the gases of a mixture on the container

pressure that is exerted by one gas as if it occupied a container by itself

half of the pressure that is exerted by the gases of a mixture on the container

sum of the individual pressures that are exerted by two or more gases

Width = 34 cm

Length = 81 cm

Step-by-step explanation:

Let length be l and width be w

Let perimeter be p or p = 2(l+w)

The length of the rectangular box is 21 centimeters less than triple the width:

This means

l = 3w - 21

Also, perimeter is 230, so

2(l+w) = 230

or

l+w = 115

Putting equation 1 in this equation, we get:

l+w=115

(3w - 21)+w=115

Solving:

(3w - 21)+w=115\\4w=136\\w=34

To find length:

l = 3w - 21

l = 3(34) - 21

l = 81

Hence

Width = 34 cm

Length = 81 cm

Step-by-step explanation:

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step-by-step explanation: